| Abstract: | Olivine trachybasalt metamorphosed by nuclear explosion is classified into categories of progressive metamorphism: (i) Weak. Plagioclase is microfractured, and augite cotainis fine twin lamellae. (ii) Moderate. Plagioclase is converted to glass, and mafic minerals show intragranular deformation (undulatory extinction, twin lamellae, and, possibly, deformation lamellae), but rock texture is preserved. (iii) Moderately strong. Plagioclase glass shows small-scale flow, mafic minerals are fractured and show intragranular deformation, and rocks contain tension fractures. (iv) Strong. Plagioclase glass is vesicular, augite is minutely fractured, and olivine is coarsely fragmented, shows mosaic extinction, distinctive lamellar structures, and is locally recrystallized. (v) Intense. Rocks are converted to inhomogeneous basaltic glass. |
| Genre: | Article |
| ProdID: | 70011516 |
| Citation Author: | James, O. B. |
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| Citation End Page: | 1620 |
| Citation Issue: | 3913 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 6 |
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| Citation Search Results Text: | Shock and thermal metamorphism of basalt by nuclear explosion, Nevada test site; 1969; Article; Journal; Science; James, O. B. |
| Citation Start Page: | 1615 |
| Citation Volume: | 166 |
| Citation Year: | 1969 |
| Type: | citation/reference |
| Text: | Shock and thermal metamorphism of basalt by nuclear explosion, Nevada test site; 1969; Article; Journal; Science; James, O. B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1969 00:00 -0600 |
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